Question about Hyundai Motor 2003 XG350
Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Once you do this and let us know what, if any codes are set, then we can go from there. You can purchase an OBDII scanner at most Automotive Retail stores (Car Quest, AutoZone, PepBoys, O'Riely's, NAPA, even Sears, K-Mart, WalMart, etc.) - prices differ depending on features of the scanner - shop around.
There are NUMEROUS systems monitored by the ECM and too little space here to list them all. Guess work is not my style - several systems can have intermittent problems and when the ECM doesn't detect it/them again, it will turn the Check Engine light OFF. For example, one of these is the Oxygen Sensors (O2snsr). When an O2 sensor starts to go bad (intermittent malfunction), the ECM will set the appropriate DTC... If it doesn't detect it again, let's say two key cycles later, it will turn the light 'OFF', but keep the DTC stored in the computer as a HISTORY code. It also keeps count as to the number of times the DTC was set.
Posted on Jun 20, 2009
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Posted on Jan 02, 2017
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